Right did some measuring up yesterday..

Need to add an upper area to a workshop..

Three outer brick wallis nice and thick which are fine.. plan is to bolt a joist along the outer wall 27ft long.. then mount joist hangers to this.. then joists coming off with a 13ft span.. then coach screwing these or joist hanger'ing these to another end joist.. obviously aint getting one 27ft long..


done a crap pic http://www.scoobyecu.co.uk/omg.jpg

so questions..

1) the parts marked A are joist hangers on two of the external walls at right angle to the joists spanning 13ft.

2) the back part that says bolt to wall.. will rawl bolts be sufficient in staggered pattern at 18" or so centres? m10 - m12? or should I bolt through the wall with studded rod and plates?

3) the ends on the free end with no support, are coach screws sufficient or is it more expensive joist hangers?

4) the point where the arrows are, could we use wood similar to a fence post sat in a met post to support the end joist? What centres should be used if so..

This is supposed to be a semi sort of permanent structure so dont really want to build a wall to sit the joists on, but open to suggestions, if it needs block work then suggest it..

Dont really want to be using RSJ's but again.. suggest away..

David

http://www.scoobyecu.co.uk/1.jpg

http://www.scoobyecu.co.uk/2.jpg

what size joist is needed to span 13ft.. ??

just reading, would 50x195mm at 400mm centres be ok? as I have found a a link that says 4.13m span with a dead load of more than 0.25 but not more than 0.50 and allows for an imposed loading of no more than 1.5 kN/sq.m. --- http://www.diydoctor.org.uk/projects/load-bearing_walls.htm

do you have a preferred joist depth or spacing?

what size joist is needed to span 13ft.. ??

13ft = 4M

195x50 @ 400mm centers
195x75 @ 600mm centers

Will need strutting ever 2M with 150x38mm or bigger timber.

cheapest is most prefered..

Any ideas for supporting the ends?

Orbv? Im assuming you mean in between each joist at the centre point if the span is 4m.. and staggered? and I assume if this is correct then theres no harm in using the same wood as the joist..

David

Im assuming you mean in between each joist at the centre point if the span is 4m.. and staggered? and I assume if this is correct then theres no harm in using the same wood as the joist..

David

In the middle of the length of the joist. Can be staggered or in a straight line down the center. Will post a pic of some I'm doing when I get home. Yes you can use the cut-off for the noggins, normally called full height noggins.

Whats wrong with using build-in joists? Just cut a hole out of the wall at the required level and slide the joist in. Dont allow the joist to enter the cavity and you will be fine.

In fact, most councils publish guidlines so just read this (http://www.tameside.gov.uk/tmbc8/note07.pdf) yourself. It may not be 100% upto date but close enough.

Going for 600mm centers over 400mm is not always cheaper as thicker flooring needs to be used (22mm/600mm or 18mm/400mm). Also if you are going to have walls supporting on the floor you will need to double up on the joists.

Some pics (http://homepage.ntlworld.com/robert.vint/building/10-08/) of the one I'm completing at the moment in my spare time. Rest of the floor should go down over the weekend then 1st fix plumbing and electrics with a few stud walls.

whats the distance between the back wall you are bolting to, and the 27ft span across?

27ft x ?ft...?

.......according to your scale its about 13'10"


double uni-strut :).

around 13ft :)

orbv - what is that you have along the top of the joists ?

orbv - what is that you have along the top of the joists ?
Rubber. Hate floors that squeak.

What sort of rubber, my internal landing squeaks madly when walked upon since a water leak slightly warped the floor boards! Any suggestions for better floor boards too?

Apols for the hijack

you can get a 27ft joist :) just go with the modern plywood joist and they can span much further than than and are really quite light as well

What sort of rubber, my internal landing squeaks madly when walked upon since a water leak slightly warped the floor boards! Any suggestions for better floor boards too?

Apols for the hijack

Just screw the boards down with a few thousand screws. Nails are for DIYers ;) To put rubber under would involve lifting the boards. You can get special stuff that costs a bomb but in the picture its 3mm ribbed cut into strips.

orbv - the special stuff that costs a bomb is what the company I work for makes :D hence the question. Very good idea using rubber though.

Vulnax999 - orbv is right just screw them down (not nail) I did the same in my kitchen.

well £1400 quids worth of wood etc was delivered today.. Legacyturbs bribed a forktruck driver to move it for him with a bottle of bud (bribed him with the bottle, not move it with the bottle..)

Might take some pics if I get chance..

David

Marvellous.

Is that a blowdogartz diagram in the first post?

Got your domain sorted yet?

fo.. will call you..